Weather in Seattle in September
Seattle temperatures in September range from 11 to 23 and there is an average of 10 days of rain.
Avg Temp
11° - 23°
Avg Rainy Days
10
Avg Dry Days
20
Avg Snow Days
0
Weather Facts - Seattle in September
* The warmest temperature recorded in in September is 33°C
* The coldest temperature recorded in Seattle in September is 1°C
* The average rainfall in Seattle in September is 26 mm